Operation, Maintenance and Handling manual for Mebrane Elements

Summary

Product Identification

This document provides operation, maintenance, and handling guidelines for TORAY REVERSE OSMOSIS ELEMENTS, including ROMEMBRA membrane elements. General references are made to "SU type" and "TM type" elements.

Operating Limits

• Feed flow rate per vessel (during air purging):
  • 8” vessel: 40 - 200 l/min
  • 4” vessel: 10 - 50 l/min
• Maximum pressure drop (feed to brine) across a pressure vessel/a single RO element:
  • Element type TM:
    • Per vessel: 0.4 MPa
    • Per single element: 0.15 MPa
  • Element type SU:
    • Per vessel: 0.3 MPa
    • Per single element: 0.1 MPa
• Maximum pressure drop across any vessel (during start-up):
  • 0.3 MPa for all SU types
  • 0.4 MPa for TM types
• Distance "A" (between product tube cap and plug in permeate adaptor of feed side end plate): Must be < 5mm (0.2 inch).
• Recovery ratio: Do not exceed design recovery ratio. System recovery should be maintained within ±2% of the intended value.
• Accepted deviation for normalized performance data (from mean value):
  • Normalized salt passage:
    • Data read by varying persons: ±20%
    • Single operator precision: ±5%
  • Normalized permeate flow rate:
    • Data read by varying persons: ±5%
    • Single operator precision: ±2%

Feed Water

• Pre-installation checks:
  • Cleanliness of system.
  • Fouling Index (SDI).
  • Turbidity (NTU).
  • Absence of chlorine and other oxidants.
  • Sufficient bisulfite surplus: A minimum of 0.5 mg/l HSO₃⁻ must be detectable in brine at any time if NaHSO₃ is used for chlorine removal.
  • Absence of flocculants, particularly cationic and nonionic compounds.
  • Filter cartridges must be free of surfactants, lubricants, and textile aids.
• Element preservation: Elements are conserved in 0.5% to 1% sodium bisulfite solution.

Product Water

• Permeate quality: Permeate flow rate and permeate quality should be within ± 5% of their intended values, assuming constant feed water quality and operating parameters.
• Monitoring: Permeate conductivity for each vessel.

Mechanical / Hydraulic

• Element installation:
  • Requires lubricating parts (e.g., O-rings, brine seals, element's product tube, vessel's inner surface) with glycerin.
  • Brine seals should be installed at the feed end of each element.
  • For SU type elements, "thrust rings" supplied by the vessel manufacturer should not be installed.
  • For TM type elements, thrust rings are necessary.
  • Toray highly recommends installing the permeate system on the brine side of pressure vessels only.
• Shimming:
  • Shims are plastic "washers," typically made of PVC or other hard plastics.
  • Inside diameter should fit over the adaptor stub (lead end).
  • Outside diameter should be not less than the diameter of the adaptor shank.
  • Typical shim thickness: 1 – 5 mm.
  • Shims are normally positioned on the upstream end of the vessel, between the endcap and the adaptor.

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions of the OEM PDF. For contractual data or complete specifications, always refer to the official PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet